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test_datadiff.py
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test_datadiff.py
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import re
import itertools
from textwrap import dedent
from datetime import datetime
import sys
import six
from nose.tools import assert_raises, assert_equal, raises
from datadiff import diff, DataDiff, NotHashable, DiffNotImplementedForType, DiffTypeError
try:
from unittest.case import SkipTest
except ImportError:
class SkipTest(Exception):
pass
# support 3.0/2.7 set literals, and <2.7
set_start, set_end = repr(set([0])).split('0')
frozenset_start, frozenset_end = repr(frozenset([0])).split('0')
def test_diff_objects():
class Foo(object): pass
try:
diff(Foo(), Foo(), fromfile="x", tofile="y")
except Exception:
e = sys.exc_info()[1]
assert_equal(type(e), DiffNotImplementedForType,
"Raised exception should be DiffNotImplementedForType")
assert_equal(e.attempted_type, Foo)
else:
raise AssertionError("Should've raised a DiffNotImplementedForType")
def test_diff_oneline_strings():
try:
diff('foobar', 'baz', fromfile="x", tofile="y")
except Exception:
e = sys.exc_info()[1]
assert_equal(type(e), DiffNotImplementedForType,
"Raised exception should be DiffNotImplementedForType")
assert_equal(e.attempted_type, str)
else:
raise AssertionError("Should've raised a DiffNotImplementedForType")
def test_diff_multiline_strings():
d = diff('abc\ndef\nghi', 'abc\nghi', fromfile="x", tofile="y")
# accommodate python 2.6 having trailing spaces after --- and +++ lines
d = '\n'.join(line.rstrip() for line in d.split('\n'))
expected = dedent('''\
--- x
+++ y
@@ -1,3 +1,2 @@
abc
-def
ghi''')
assert_equal(str(d), expected)
def test_diff_unicode_vs_str():
if six.PY3:
raise SkipTest("Unicode and bytes are different types")
d = diff(six.u('abc\ndef\nghi'), b'abc\nghi', fromfile="x", tofile="y")
# accommodate python 2.6 having trailing spaces after --- and +++ lines
d = '\n'.join(line.rstrip() for line in d.split('\n'))
expected = dedent('''\
--- x
+++ y
@@ -1,3 +1,2 @@
abc
-def
ghi''')
assert_equal(str(d), expected)
def test_diff_list():
a = [1,'xyz', 2, 3, 4, 5]
b = [1,'abc', 2, 4, 6]
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
[
@@ -0,5 +0,4 @@
1,
-'xyz',
+'abc',
2,
-3,
4,
-5,
+6,
]''')
assert_equal(str(d), expected)
def test_diff_list_context():
a = [1]*50 + [2, 3, 4, 5, 6, 7, 8] + [1]*10
b = [1]*50 + [3, 9, 10] + [1]*10
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
[
@@ -46,59 +46,55 @@
1,
1,
1,
-2,
3,
-4,
-5,
-6,
-7,
-8,
+9,
+10,
1,
1,
1,
@@ @@
]''')
assert_equal(str(d), expected)
def test_diff_list_2nd_longer():
a = [3]
b = [4, 5]
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
[
@@ -0 +0,1 @@
-3,
+4,
+5,
]''')
assert_equal(str(d), expected)
def test_diff_list_list():
a = [1, [2, 3], 4]
b = [1, 4]
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
[
@@ -0,2 +0,1 @@
1,
-[2, 3],
4,
]''')
assert_equal(str(d), expected)
def test_diff_list_dict():
a = [1, {'a': 'b'}, 4]
b = [1, 4]
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
[
@@ -0,2 +0,1 @@
1,
-{'a': 'b'},
4,
]''')
assert_equal(str(d), expected)
def test_diff_list_set():
a = [1, set([8, 9]), 4]
b = [1, 4]
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
[
@@ -0,2 +0,1 @@
1,
-%s8, 9%s,
4,
]''') % (set_start, set_end)
assert_equal(str(d), expected)
def test_diff_seq_objects():
class FooSeq(object):
def __init__(self, list):
self.list = list
def __len__(self):
return len(self.list)
def __iter__(self):
return iter(self.list)
def __getitem__(self, x):
return self.list[x]
d = diff(FooSeq([1]), FooSeq([1,2]), fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
FooSeq([
@@ -0 +0,1 @@
1,
+2,
])''')
assert_equal(str(d), expected)
def test_diff_almost_seq_objects():
class FooSeq(object):
def __init__(self, list):
self.list = list
def __iter__(self):
return iter(self.list)
assert_raises(DiffTypeError, diff, FooSeq([1]), FooSeq([1,2]))
def test_tuple():
d = diff((1,2), (1,3), fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
(
@@ -0,1 +0,1 @@
1,
-2,
+3,
)''')
assert_equal(str(d), expected)
def test_diff_dict():
a = dict(zero=0, one=1, two=2, three=3, nine=9, ten=10)
b = dict(zero='@', one=1, three=3, four=4, nine=9, ten=10)
d = diff(a, b, fromfile="x", tofile="y")
# result should look something like this:
dedent('''\
--- x
+++ y
{
+'four': 4,
'nine': 9,
'ten': 10,
'three': 3,
-'two': 2,
-'zero': 0,
+'zero': '@',
@@ @@
}''')
# but due to arbitrary key ordering, may differ in the
# context.
diff_str = str(d)
assert "+'four': 4," in diff_str
assert "-'two': 2," in diff_str
assert "-'zero': 0," in diff_str
assert "+'zero': '@'," in diff_str
context_pattern = "^ '\w+': \d+,$"
assert_equal(_count_lines(context_pattern, diff_str), 3)
def _count_lines(pattern, str):
"""
Count the number of lines that match pattern
"""
context_lines = re.finditer(pattern, str, re.M)
counter = itertools.count()
list(zip(context_lines, counter))
return next(counter)
def test_diff_dict_keytypes():
a = {}
b = {datetime(2010,10,28): 1, True: 1, 2: 2}
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
{
+True: 1,
+2: 2,
+datetime.datetime(2010, 10, 28, 0, 0): 1,
}''')
assert_equal(str(d), expected)
def test_diff_dict_complex():
a = dict(a=1, b=dict(foo='bar'))
b = dict(a=1)
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
{
'a': 1,
-'b': {'foo': 'bar'},
}''')
assert_equal(str(d), expected)
def test_diff_set(set_type=set):
a = set_type([1, 3, 5, 7, 'abc', 'def'])
b = set_type(['qwert', 3, 7, 'abc'])
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
%s([
-1,
-5,
-'def',
+'qwert',
3,
'abc',
7,
])''') % set_type.__name__
assert_equal(str(d), expected)
def test_diff_set_context():
a = set([1, 2, 3, 4, 5, 6, 7, 8, 9])
b = set([1, 2, 3, 4, 5, 6, 7, 8])
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
set([
-9,
1,
2,
3,
@@ @@
])''')
assert_equal(str(d), expected)
def test_diff_frozenset():
return test_diff_set(set_type=frozenset)
def test_eval_bool():
d = diff([1], [1], fromfile="x", tofile="y")
assert_equal(bool(d), False)
d = diff([1], [2], fromfile="x", tofile="y")
assert_equal(bool(d), True)
d = diff(dict(a=1), dict(a=1), fromfile="x", tofile="y")
assert_equal(bool(d), False)
def test_equal():
d = diff([1], [1], fromfile="x", tofile="y")
assert_equal(str(d), '')
@raises(DiffTypeError)
def test_diff_types():
d = diff([1], {1:1}, fromfile="x", tofile="y")
@raises(Exception)
def test_DataDiff_init_params():
DataDiff(list, '[')
def test_DataDiff_change_type():
dd = DataDiff(list, '[', ']')
dd.multi('foobar', [1234])
assert_raises(Exception, str, dd)
def test_unhashable_type():
a = []
b = [slice(1)]
assert_raises(NotHashable, diff, a, b)
def test_recursive_list():
a = [1, [7, 8, 9, 10, 11], 3]
b = [1, [7, 8, 10, 11], 3]
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
[
@@ -0,2 +0,2 @@
1,
[
@@ -0,4 +0,3 @@
7,
8,
-9,
10,
11,
],
3,
]''')
assert_equal(str(d), expected)
def test_recursive_tuple_different_types():
a = (1, (7, 8, 9, 10, 11), 3)
b = (1, (7, 8, 'a', 10, 11), 3)
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
(
@@ -0,2 +0,2 @@
1,
(
@@ -0,4 +0,4 @@
7,
8,
-9,
+'a',
10,
11,
),
3,
)''')
assert_equal(str(d), expected)
def test_recursive_dict():
a = dict(a=1, b=dict(foo=17, bar=19), c=3)
b = dict(a=1, b=dict(foo=17, ), c=3)
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
{
'a': 1,
'b': {
-'bar': 19,
'foo': 17,
},
'c': 3,
}''')
assert_equal(str(d), expected)
def test_recursive_set():
a = set([1, 2, frozenset([3, 4, 5]), 8])
b = set([1, 2, frozenset([3, 2, 5]), 8])
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
set([
-%s3, 4, 5%s,
+%s2, 3, 5%s,
8,
1,
2,
])''' % (frozenset_start, frozenset_end,
frozenset_start, frozenset_end))
assert_equal(str(d), expected)
def test_nested_unhashable():
# dict is unhashable, and nested in a list
a = [('Wiki.test', dict(user_id='badf00d', mount_point='Wiki'))]
b = [('Wiki.test', dict(user_id='abc'))]
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
[
@@ -0 +0 @@
(
@@ -0,1 +0,1 @@
'Wiki.test',
{
-'mount_point': 'Wiki',
-'user_id': 'badf00d',
+'user_id': 'abc',
},
),
]''')
assert_equal(str(d), expected)
def test_nested_unhashable2():
# dict is unhashable, and nested in another dict
a = [dict(foo = dict(user_id='badf00d', mount_point='Wiki'))]
b = [dict(foo = dict(mount_point='Wikiiii'))]
d = diff(a, b, fromfile="x", tofile="y")
expected = dedent('''\
--- x
+++ y
[
@@ -0 +0 @@
{
'foo': {
-'mount_point': 'Wiki',
+'mount_point': 'Wikiiii',
-'user_id': 'badf00d',
},
},
]''')
assert_equal(str(d), expected)
def test_list_compare_with_func():
a = [1, 2, 3, lambda v: True]
b = [1, 2, 3, 'abc']
d = diff(a, b, fromfile="x", tofile="y", compare_with_func=True)
assert_equal(str(d), '')
def test_nested_unhashable_compare_with_func_equal():
# dict is unhashable, and nested in another dict compares with func
a = [dict(foo = dict(user_id=lambda v: True, mount_point='Wiki'))]
b = [dict(foo = dict(user_id='badf00d', mount_point='Wiki'))]
d = diff(a, b, fromfile="x", tofile="y", compare_with_func=True)
assert_equal(str(d), '')
def true(v):
return True
def false(v):
return False
def test_nested_unhashable_compare_with_func_diff():
a = [1, 2, 3, dict(foo = dict(user_id=false, mount_point='Wiki'), bar = true), 6, 7, 8, 'diff', 9]
b = [1, 2, 3, dict(foo = dict(user_id='badf00d', mount_point='Wiki'), bar = 'qaz'), 6, 7, 8, 9]
d = diff(a, b, fromfile="x", tofile="y", compare_with_func=True)
expected = dedent('''\
--- x
+++ y
[
@@ -0,8 +0,7 @@
1,
2,
3,
{
'bar': 'qaz',
'foo': {
'mount_point': 'Wiki',
-'user_id': %r,
+'user_id': 'badf00d',
},
},
6,
7,
8,
-'diff',
9,
]''') % (false,)
assert_equal(str(d), expected)
def test_nested_unhashable_compare_with_func_diff2():
a = [1, 2, 3, (dict(foo = dict(user_id=false, mount_point='Wiki'), bar = true), 6, 7, 8, 'diff', 9)]
b = [1, 2, 3, (dict(foo = dict(user_id='badf00d', mount_point='Wiki'), bar = 'qaz'), 6, 7, 8, 9)]
d = diff(a, b, fromfile="x", tofile="y", compare_with_func=True)
expected = dedent('''\
--- x
+++ y
[
@@ -0,3 +0,3 @@
1,
2,
3,
(
@@ -0,5 +0,4 @@
{
'bar': 'qaz',
'foo': {
'mount_point': 'Wiki',
-'user_id': %r,
+'user_id': 'badf00d',
},
},
6,
7,
8,
-'diff',
9,
),
]''') % (false,)
assert_equal(str(d), expected)
def test_seq_compare_with_func_diff():
a = []
b = [1]
d = diff(a, b, fromfile="x", tofile="y", compare_with_func=True)
expected = dedent('''\
--- x
+++ y
[
@@ -0 +0 @@
+1,
]''')
assert_equal(str(d), expected)
def test_seq_compare_with_func_diff2():
a = [1]
b = []
d = diff(a, b, fromfile="x", tofile="y", compare_with_func=True)
expected = dedent('''\
--- x
+++ y
[
@@ -0 +0 @@
-1,
]''')
assert_equal(str(d), expected)